280 LEPIDONOTUS CLAVA. 



Pallas (' Miscellanea Zoologica ') mentions that Linnaeus found it in deep water. 

 It occurs also with pelagic Fuci, and amongsb the latter and Sertularians at the bottom of 

 the sea. He gives an account of the external appearance and arrangement of the scales, 

 and a brief outline of its anatomy. 



It is doubtfulif 0. F. Miiller's Aphrodita punctata refers entirely to this form, since 

 he speaks of sub-crescentic bluish spots. 



Audouin and Milne Edwards (1834) describe it as having twenty-seven segments, 

 and reaching eighteen lines in length. They think that the Polynoe punctata of 0. F. 

 Miiller comes near P. squamata, and so with the Aphrodita clavigera of M. Freminville ; l 

 but this cannot be, as M. Freminville found it phosphorescent. 



It is difficult to say what H. Rathke's (1837) Polynoe granulosa 2 is. It may be 

 this species in which a pair of scales has been lost. 



Leidy's 3 L, armadillo appears to be allied to this species or to L. clava. His 

 observation in regard to the unusual number of the tentacles is erroneous. 



Kinberg 4 rested jhis specific characters on the comparative length of the tentacles, 

 and the fact that the inferior bristles were serrated below the apex. He gave a correct 

 account of the scales. De Quatrefages 5 adds nothing new to the foregoing, and he 

 includes Lepidonotus clava, Mont., as a synonym, though with doubt. Subsequent French 

 authors have corrected this error. 



2. Lepidonotus olava, Montagu. Plate XXVI, fig. 1. 



Specific Characters. — Head similar to that of L. squamatus. The large anterior eyes 

 are in front of the middle line, and the respective pairs on each side are wider apart. 

 Anteriorly the broad basal region of the median tentacle is more distinctly separated 

 from the bases of the lateral tentacles than in L. squamatus, and the transverse diameter 

 of the three processes is greater. Median and lateral tentacles thicker, and the bulbous 

 region below the tip marked by a more distinct band of blackish pigment. Palpi with 

 five rows of minute papillse. Segments twenty-seven, characteristically marked with 

 pigment on the dorsum ; segmental (nephridial) papillaa large and thick. Scales more or 

 less circular throughout, and do not quite cover the dorsum, more flexible than in L. 

 squamatus, and, with the exception of the first four pairs, smooth. The first three have 

 numerous small tubercles generally distributed, while the fourth pair have a smaller 

 number. Papilla for the dorsal bristles more prominent than in L. squamatus. The dorsal 

 bristles are shorter, thicker, less tapered and more curved than in L. squamatus, but 

 have similar structure. The ventral bristles have shorter curved or falcate tips, with 

 fewer rows of spikes, and the bare portion is shorter than in L. squamatus. 



1 f Nouveau Bulletin de Sc. par la Soc. Philomat./ iii, p. 253. 



2 c Beitr. z. Fauna der Krym/ p. 408. 



3 ' Americ. Journ. Nat. Sc./ p. 148, pi. xi, f. 54. 



4 Op. cit., 1857. 



5 Op. ait., 1865. 



